Qualification requirements for flywheel energy storage design

What is flywheel energy storage system (fess)?

but lower energy density, longer life cycles and comparable efficiency, which is mostly attractive for short-term energy storage.Flywheel energy storage systems (FESS) have been used in uninterrupted power supply (UPS) –, brake energy recovery for ra

How much energy is stored in a composite flywheel?

Typical energies stored in a single unit range from less than a kilowatt-hour to levels approaching 150 kilowatt-hours. Thus, a single composite flywheel can be equivalent, in stored energy, from one to more than 100 automotive batteries. Moreover, in flywheel systems, the stored energy and output power are relatively independent of each other.

What factors should be considered when designing a flywheel system?

The steady-state loss is another vital factor that should be taken into account. The flywheel system is a standby system and in the steady state has no electrical load. Thus, minimising its losses at the no-load state is crucial.

How does a flywheel energy storage system work?

flywheel energy storage system typically works by combining a high-strength, high-momentum rotor with a shaft-mounted motor/generator. This assembly is contained inside a vacuum / containment vessel and operates normally in a non-contact fashion with magnetic bearings acting as a suspension system.

How much energy does a fess flywheel use?

With the high energy requirement for the flywheel system, the bearing loss can be great enough to significantly reducing the overall system efficiency. The 5 kWh / 100 kW FESS utilizes the hybrid HTS magnetic bearings .

What is a flywheel electrical system?

The basic concept of a flywheel electrical system is noted in figure 1. Other common power electronic circuits invert power from the motor/generator to line voltages and frequencies. 1 Funded in part by the Energy Storage Systems Program of the U.S. Department Of Energy (DOE/ESS) through Sandia National Laboratories (SNL).